On Wed, Mar 9, 2022 at 5:06 AM Xi Ruoyao via Gcc-patches
<gcc-patches@gcc.gnu.org> wrote:
>
> This should be obvious, OK for trunk?
OK.
> -- >8 --
>
> Calling VECTOR_MODE_P with MAX_MACHINE_MODE has caused out-of-bound
> access.
>
> gcc/
>
> PR tree-optimization/104851
> * optabs-query.cc (supports_vec_convert_optab_p): Fix off-by-one
> error.
> ---
> gcc/optabs-query.cc | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/gcc/optabs-query.cc b/gcc/optabs-query.cc
> index 713c098ba4e..68dc679cc6a 100644
> --- a/gcc/optabs-query.cc
> +++ b/gcc/optabs-query.cc
> @@ -720,7 +720,7 @@ static bool
> supports_vec_convert_optab_p (optab op, machine_mode mode)
> {
> int start = mode == VOIDmode ? 0 : mode;
> - int end = mode == VOIDmode ? MAX_MACHINE_MODE : mode;
> + int end = mode == VOIDmode ? MAX_MACHINE_MODE - 1 : mode;
> for (int i = start; i <= end; ++i)
> if (VECTOR_MODE_P ((machine_mode) i))
> for (int j = MIN_MODE_VECTOR_INT; j < MAX_MODE_VECTOR_INT; ++j)
> --
> 2.35.1
>
>
